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Spin-torque Magnetic Resonance of Fe Nanoparticles in Fe/MgO/Fe Magnetic Tunnel Junctions
S. Miwa,N. Mizuochi,T. Shinjo,Y. Suzuk,S. Kim,Y. Jo,박승영 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetic resonance of Fe nanoparticles has been observed in single-crystal Fe/MgO/Fe magnetictunnel junctions (MTJs). In the MTJs, one magnetic layer is a continuous Fe film, whichacts as a magnetic reference layer, and the other is made up of noncontinuous nanoparticles of Fe,which act as a free layer. The magnetic resonance is electrically excited by the spin torque andis detected as the homodyne detection voltage, which is called the spin-torque diode effect. Fromthe magnetoresistance characteristics, the average diameter of the Fe nanoparticles is estimatedto be 6.8 nm; these nanoparticles exhibit superparamagnetic behavior at room temperature. Thisspin-torque magnetic resonance in magnetic nanoparticles enables us to study the magnetizationdynamics in small spin systems.
MgO Overlayer Thickness Dependence of Perpendicular Magnetic Anisotropy in CoFeB Thin Films
D. D. Lam,F. Bonell,S. Miwa,Y. Shiota,K. Yakushiji,H. Kubota,T. Nozaki,A. Fukushima,S. Yuasa,Y. Suzuki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
The dependence of the magnetization and perpendicular magnetic anisotropy (PMA) of Ta/CoFeB/MgO/Ta on the thicknesses of the CoFeB layer and the MgO overlayer was investigated by vibrating sample magnetometer. The magnetization is found to be small for samples with a thin MgO overlayer. The PMA strongly depends on the MgO overlayer (hereafter, MgO) thickness and its maximum value of 1.74 erg/cm2 is achieved for a 1.0 nm thick MgO overlayer with annealing at 300 ◦C. The volume anisotropy of the CoFeB layer is found to be independent of the MgO thickness,which suggest that only the interface anisotropy depends on the MgO thickness. The possible mechanisms that may influence the interface magnetization and anisotropy are discussed herein.
D. D. Lam,F. Bonell,S. Miwa,Y. Shiota,K. Yakushiji,H. Kubota,T. Nozaki,A. Fukushima,S. Yuasa,Y. Suzuki 한국자기학회 2013 Journal of Magnetics Vol.18 No.1
The perpendicular magnetic anisotropy of sputtered CoFeB thin films covered by MgO was investigated by vibrating sample magnetometry. Three different CoxFe80-xB₂? alloys were studied. Under out-of plane magnetic field, the saturation field was found to increase with increasing the Co content. The magnetization and interface anisotropy energy were obtained for all samples. Both showed a marked dependence on the MgO overlayer thickness. In addition, their variations were found to be non-monotonous as a function of the Co concentration.
Second Asian Consensus on Irritable Bowel Syndrome
Kok-Ann Gwee,Sutep Gonlachanvit,Uday C Ghoshal,Andrew S B Chua,Hiroto Miwa,Justin Wu,Young-Tae Bak,Oh Young Lee,Ching-Liang Lu,Hyojin Park,Minhu Chen,Ari F Syam,Philip Abraham,Jose Sollano,Chi-Sen Cha 대한소화기 기능성질환∙운동학회 2019 Journal of Neurogastroenterology and Motility (JNM Vol.25 No.3
Background/AimsThere has been major progress in our understanding of the irritable bowel syndrome (IBS), and novel treatment classes have emerged. The Rome IV guidelines were published in 2016 and together with the growing body of Asian data on IBS, we felt it is timely toupdate the Asian IBS Consensus. MethodsKey opinion leaders from Asian countries were organized into 4 teams to review 4 themes: symptoms and epidemiology,pathophysiology, diagnosis and investigations, and lifestyle modifications and treatments. The consensus development process wascarried out by using a modified Delphi method. ResultsThirty-seven statements were developed. Asian data substantiate the current global viewpoint that IBS is a disorder of gut-braininteraction. Socio-cultural and environmental factors in Asia appear to influence the greater overlap between IBS and uppergastrointestinal symptoms. New classes of treatments comprising low fermentable oligo-, di-, monosacharides, and polyols diet,probiotics, non-absorbable antibiotics, and secretagogues have good evidence base for their efficacy. ConclusionsOur consensus is that all patients with functional gastrointestinal disorders should be evaluated comprehensively with a view toholistic management. Physicians should be encouraged to take a positive attitude to the treatment outcomes for IBS patients.
Corrigendum : 2019 Seoul Consensus on Esophageal Achalasia Guidelines
( Hye-Kyung Jung ),( Su Jin Hong ),( Oh Young Lee ),( John Pandolfino ),( Hyojin Park ),( Hiroto Miwa ),( Uday C Ghoshal ),( Sanjiv Mahadeva ),( Tadayuki Oshima ),( Minhu Chen ),( Andrew S B Chua ),( 대한소화기기능성질환·운동학회 2021 Journal of Neurogastroenterology and Motility (JNM Vol.27 No.3
2019 Seoul Consensus on Esophageal Achalasia Guidelines
( Hye-kyung Jung ),( Su Jin Hong ),( Oh Young Lee ),( John Pandolfino ),( Hyojin Park ),( Hiroto Miwa ),( Uday C Ghoshal ),( Sanjiv Mahadeva ),( Tadayuki Oshima ),( Minhu Chen ),( Andrew S B Chua ),( 대한소화기기능성질환·운동학회 2020 Journal of Neurogastroenterology and Motility (JNM Vol.26 No.2
Esophageal achalasia is a primary motility disorder characterized by insufficient lower esophageal sphincter relaxation and loss of esophageal peristalsis. Achalasia is a chronic disease that causes progressive irreversible loss of esophageal motor function. The recent development of high-resolution manometry has facilitated the diagnosis of achalasia, and determining the achalasia subtypes based on high-resolution manometry can be important when deciding on treatment methods. Peroral endoscopic myotomy is less invasive than surgery with comparable efficacy. The present guidelines (the “2019 Seoul Consensus on Esophageal Achalasia Guidelines”) were developed based on evidence-based medicine; the Asian Neurogastroenterology and Motility Association and Korean Society of Neurogastroenterology and Motility served as the operating and development committees, respectively. The development of the guidelines began in June 2018, and a draft consensus based on the Delphi process was achieved in April 2019. The guidelines consist of 18 recommendations: 2 pertaining to the definition and epidemiology of achalasia, 6 pertaining to diagnoses, and 10 pertaining to treatments. The endoscopic treatment section is based on the latest evidence from meta-analyses. Clinicians (including gastroenterologists, upper gastrointestinal tract surgeons, general physicians, nurses, and other hospital workers) and patients could use these guidelines to make an informed decision on the management of achalasia. (J Neurogastroenterol Motil 2020;26:180-203)
( Motoyori Kanazawa ),( Shigemi Nakajima ),( Tadayuki Oshima ),( William E Whitehead ),( Ami D Sperber ),( Olafur S Palsson ),( Douglas A Drossman ),( Hiroto Miwa ),( Shin Fukudo ) 대한소화기기능성질환·운동학회 2015 Journal of Neurogastroenterology and Motility (JNM Vol.21 No.4
Background/Aims Reliable diagnostic instruments for measuring the presence of functional gastrointestinal disorders based on the Rome III criteria have been lacking in Japan. The aims of the present study were to translate and validate the Rome III diagnostic questionnaire which was widely used in Western countries. Methods The original version of Rome III diagnostic questionnaire was translated from English into Japanese through 3 independent forward translations, resolution, back translation and reconciliation of the differences. Forty-nine patients with irritable bowel syndrome (IBS), 32 patients with functional dyspepsia (FD) and 56 subjects without any current GI symptoms as controls were recruited from three hospitals located in different regions of Japan and completed the IBS and FD diagnostic modules twice within 14 days. Kappa statistic was used to assess test-retest reliability. The sensitivity and specificity of each diagnostic module for distinguishing IBS or FD patients from controls was tested. Results Median kappa statistics were 0.63 for the translated IBS diagnostic module and 0.68 for the FD module. The sensitivity, specificity, and positive predict value of the IBS module against physician diagnosis was 61.2%, 100%, and 100% and those of the FD module was 53.2%, 98.2%, and 94.4%, respectively. Meanwhile, IBS patients were significantly more likely to report blood in stools compared to controls (18.4% vs 1.8%, P < 0.01). Conclusions The IBS and FD diagnostic modules on the Japanese version of the Rome III diagnostic questionnaire are valid and reliable. Further studies are warranted to elucidate the diagnostic utility of the red flag questionnaire. (J Neurogastroenterol Motil 2015;21:537-544)